> If you’re running Firefox on macOS you might have noticed that its responsiveness has improved significantly in version 103, especially if you’ve got a lot of tabs, or when your machine is busy running other applications at the same time.

Nope. Sorry. It might actually be faster, but I haven't noticed anything over the last several months. I have FF/Mac/m1 open for hours per day, multiple tabs. Nothing jumped out from performance where it was noticeable.